How popular is Arnout?

Arnout is an uncommonly occurring first name for men. Arnout is an uncommon last name too for all people. (2000 U.S. DEMOGRAPHICS)

Which version is better?

Popular variation forms of Arnout (NOT RANKED) listed in the Top 2000 are Arne, Arnell, Arnie, Arno, Arnold(#1618 IN RECENT RANKINGS) and Arnoldo. Other forms, like Arny, are uncommon. Usage of these relations of Arnout was more pronounced among parents in the 1910s (ADOPTION OF 0.2%) and is now much diminished, with the form Arnold becoming less in vogue. (2016 BIRTH STATISTICS)